using EyesAndEars.UWP.Models;
using System;
using System.Diagnostics;
using System.Text.Json;
using System.Threading.Tasks;
using Windows.UI;
using Windows.UI.Xaml.Media;

namespace EyesAndEars.UWP.Services {
    public static class DataServices {

        public static async Task<Device> UpdateDevice(string url, int deviceId) {
            try {
                var id = MapFactoryDeviceToGalleyDevice(deviceId);
                var readingAPI = $"{url}/api/readings/latest/{id}";
                var statusAPI = $"{url}/api/status/latest/{deviceId}";
                var readingJSON = await WebServices.GetJSON(readingAPI);
                var statusJSON = await WebServices.GetJSON(statusAPI);
                var r = MapToLightReading(readingJSON);
                var s = MapToDeviceStatus(statusJSON);
                var c = UpdateStatusColour(s.status);
                return new Device(deviceId, r, s, c);
            }
            catch (Exception e) {
                Debug.WriteLine($"ERROR: {e.Message}");
                return CreateFallBackDevice(deviceId);
            }
        }

        static SolidColorBrush UpdateStatusColour(string status) {
            return status.Equals("on", StringComparison.OrdinalIgnoreCase) ? 
                new SolidColorBrush(Colors.SeaGreen) : 
                new SolidColorBrush(Colors.DarkRed);
        }

        static int MapFactoryDeviceToGalleyDevice(int deviceId) {
            int id = 0;
            if (deviceId > 3) {
                switch (deviceId) {
                    case 4:
                        id = 1;
                        break;
                    case 5:
                        id = 2;
                        break;
                    case 6:
                        id = 3;
                        break;
                    default:
                        break;
                }
            }
            else {
                id = deviceId;
            }
            return id;
        }

        static LightReading MapToLightReading(string json) {
            var reading = JsonSerializer.Deserialize<LightReading>(json);
            return reading;
        }

        static DeviceStatus MapToDeviceStatus(string json) {
            var status = JsonSerializer.Deserialize<DeviceStatus>(json);
            return status;
        }

        public static Device CreateFallBackDevice(int deviceId) {
            // "999" and "err" are acting as sentinals in this context.
            var r = new LightReading { id = 0, reading = 999, time = DateTime.Now };
            var s = new DeviceStatus { id = 0, status = "err", time = DateTime.Now };
            var c = new SolidColorBrush(Colors.DarkOrange);
            var d = new Device(deviceId, r, s, c);
            return d;
        }
    }
}